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It's a way to add two-factor authentication to your website or app. Instead of having people log in with just username and password, they'll also have to enter a code. They get the code from the Authy app on their phone.

(PS I'm not affiliated with Authy, just trying to be helpful.)

Two-factor auth as a service for what is likely software as a service?

Basically, yeah. Goes well with platform-as-a-service for software-as-a-service, full-text-indexing-as-a-service for software-as-a-service, payment-as-a-service for software-as-a-service, etc.

Easier to snap these components together than roll your own.

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